"Our ancestors, and those who were considered to be wise, were
accustomed to say that it was necessary to control Pistoia by means of
factions and Pisa by means of fortresses; so they fostered strife in
various of their subject towns, so as to control them more easily. In
those days, when there was stability of a sort in Italy, this was
doubtless sensible; but I do not think it makes a good rule today. I do
not believe any good at all ever comes from dissension. On the contrary,
on the approach of the enemy, cities which are so divided inevitably
succumb at once; the weaker faction will always go over to the invader,
and the other will not be able to hold out."1

What does this paragraph say to a system administrator or security
officer seeking insight to defend her systems?